Direct conversion
Convert joule [J] to kilowatt-hour [kWh] instantly with formula, examples, chart, and FAQs.
Quick answer
Use the calculator below for any custom value, then check the formula, examples, chart, and reverse conversion links.
1 joule [J] = 2.777778E-7 kilowatt-hour [kWh]
1 joule [J] = 2.777778E-7 kilowatt-hour [kWh]
Example: 1 joule [J] equals 2.777778E-7 kilowatt-hour [kWh].
Energy conversions use joule as the reference unit, including electrical, thermal, nutrition, and mechanical energy units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
The joule is the SI derived unit of energy, work, and heat.
HistoryThe joule is named after James Prescott Joule and became the standard SI energy unit.
Current useJoules are used in physics, engineering, nutrition science, batteries, heating, and mechanical work.
The kilowatt-hour is an energy unit equal to the energy used by one kilowatt of power for one hour.
HistoryKilowatt-hours became common through electric utility metering and billing.
Current useKilowatt-hours are used for electricity bills, batteries, appliances, solar systems, and energy planning.
| joule [J] | kilowatt-hour [kWh] |
|---|---|
| 1 | 2.777778E-7 |
| 2 | 5.555556E-7 |
| 5 | 0.000001 |
| 10 | 0.000003 |
| 20 | 0.000006 |
| 25 | 0.000007 |
| 50 | 0.000014 |
| 100 | 0.000028 |
| 1000 | 0.000278 |
Use this formula: 1 joule [J] = 2.777778E-7 kilowatt-hour [kWh] Enter your value in the calculator and the result updates instantly.
1 joule [J] equals 2.777778E-7 kilowatt-hour [kWh].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.